Stenoninereis Wesenberg-Lund, 1958

Conde-Vela, Victor Manuel, 2019, Sinkhole and brackish water nereidid polychaetes: Revision of Stenoninereis Wesenberg-Lund, 1958 (Annelida), Subterranean Biology 30, pp. 95-115 : 97

Genus Stenoninereis Wesenberg-Lund, 1958

Stenoninereis Wesenberg-Lund 1958: 12.

Type species.

Stenoninereis martini Wesenberg-Lund, 1958, by monotypy.

Diagnosis

(modified from León-González and Solís-Weiss 1997, additions are highlighted in boldface). Prostomium with anterior margin cleft. Antennae and eyes present. Four pairs of anterior cirri. Pharynx bare. First two chaetigers with neuroacicular ligules and ventral cirri only. Anterior chaetigers with dorsal cirrophores and notopodial dorsal ligules ciliated. Dorsal cirri with distinct cirrophores and cirrostyles throughout body. Notopodial dorsal ligules present in anterior and middle chaetigers, disappearing in posterior-most ones; neuropodial ventral ligules absent throughout body. Notochaetae sesquigomph spinigers; neurochaetae sesquigomph spinigers and falcigers and heterogomph falcigers in supra-acicular fascicles, heterogomph spinigers and falcigers in sub-acicular fascicles. Pygidium with two plate-like lobes.

Remarks.

Main morphological features of Stenoninereis species are depicted in Figure 1 . The species S. tecolutlensis was described as having two notopodial fascicles, the superior one bearing homogomph spinigers and the inferior one with sesquigomph spinigers. However, after the examination of the holotype (USNM 174870), there are no notopodial homogomph spinigers, likely being that indication an artifact due to the position of the shaft, and therefore this feature is deleted from the emended diagnosis.

Figures

Figure 1. Morphology of Stenoninereis species A non-type of S. lackeyi comb. n. (USNM 53273) B, I syntypes of S. elisae sp. nov. (USNM 55366) C-F non-type of S. elisae sp. nov. (USNM 55360) G non-type of S. martini Wesenberg-Lund 1958 (USNM 61623) H holotype of S. tecolutlensis de Leon-Gonzalez & Solis-Weiss, 1997 (USNM 174870) A anterior end, dorsal view B chaetiger 6, left parapodium (solid and dashed red lines: vessels; solid and dashed light blue lines: unknown structures, likely nerves) C shaft of notopodial sesquigomph spinigers, chaetiger 20 D shaft of neuropodial supra-acicular sesquigomph spiniger, same chaetiger E shaft of neuropodial sub-acicular heterogomph spiniger, chaetiger 20 F Shaft of neuropodial sub-acicular heterogomph falciger, chaetiger 20 G-I anterior ends, dorsal view. Abbreviations: AC, anterior cirri; An, antennae; Cp, cirrophore; Cs, cirrostyle; DC, dorsal cirrus; Es, esophagus; NeL, neuroacicular ligule; NoD, notopodial dorsal ligule; NoV, notopodial ventral ligule; Ph, pharynx; Pp, palpophore; Ps, palpostyle; VC, ventral cirrus; ¿?, unknown structures, likely nerves by their position. Scale bars: 0.2 mm (A, G-I); 0.1 mm (B); 5 µm (C-F).